Pump-rod coupling.



PATENTED DEG. 1l, 1906, LE ROY PITCHER.

PUMP ROD COUPLING.

APPLIUATION FILED APR.2.1908,

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UNITED STATES PATENT OFFICE.

PUMP-ROD COU PLING.

Specification of Letters Patent.

Patented Dee. 11, i906.

Application filed April 2, 1906. Serial No. 309.455.

To a/ZZ whom, it 77mg concern,.-

Be it known that I, LE ROY PITCHER, a citizen of the United States, anda resident of Oilcenter, in the county of Kern and State of California,have invented a new and Improved Pump-Rod Coupling, of 'which thefollowing is a full, clear, and exact description.

The invention relates to oil-well and other pumps and its object is toprovide a new and improved pump-rod coupling arranged to permit theconvenient disconnection of pump-rods from the pump to allow thewithdrawal of the pump-rods without danger of disconnecting the pump-rodsections in case the pump-plunger 1s sanded up.

The invention consists of novel features and parts and combinations ofthe same, which will be more fully described hereinafter, and thenpointed out in the claims.

A practical embodiment oi' the invention is represented in theaccompanying drawings, forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts inall'views.

Figure l is a sectional side elevation of the improvement as applieddirectly to the top cage of the pump-plunger. Fig. 2 is a like view ofthe improvement as applied to the pump-rod, one section above thepumpplunger. Fig. 3 is an enlarged side elevation of the coupling-rod.Fig. 4 is an enlarged sectional side elevation or' the coupling nut orsleeve, and Fig. 5 is a plan view oil the same.

The improved coupling consists, essentially, of a coupling-rod A and anut or sleeve B, of which the coupling-rod A is provided at its upperend with a right-hand screwthread A and at its lower end with a lefthandscrew-thread A2, and the said'nut or sleeve B is provided at its upperend 'with a single left-hand screw-thread B and in its lower portionwith two right-hand screwthreads B2 B3 of different bores or diameters.The screw-thread A of the couplin -rod A is adapted to screw into acoupling forming part ofthe entire pump-rod of the pump, and in the saidcoupling C screws the first pump-rod section C', connected at its upperend with a coupling C2, engaged by the neXt section C3, and so on throngout the entire length of the pump-rod. It is understood that the severalsections C C3 of the pumprod screw in the corresponding couplings C C2,while the right-hand threads and the left-hand threads A2 of thecoupling-rod A screw into the corresponding threads B of the couplingnut or sleeve B. As illustrated in Fig. 1, the right-hand threadB2 ofthe nut or sleeve B screws onto the threaded top D of a cage E, formingpart of a plunger F, mounted to reciprocate in the casing G of the pump.

Now by the arrangement described it will be seen that the severalsections of the pum rod are connected with each other in tlla3 mannerdescribed, and the lowermost coupling C is connected by a right-handthread with the cou ling-rod A, which in turn screws by the ett-handthreads A2 into the corresponding threads B of the nut or sleeve B, andthe latter again screws by the righthand screw-threads B2 onto the top Bof the cage E. Now when the plunger F is sanded up in the casing G andit is desired to withdraw the pump-rod and leave the plunger F down inthe casing G then it is only necessary for the operator to turn theupper end of the pump-rod in a left-hand direction to unscrew thescrew-thread A2 from the screwthread B without danger of disturbing anyof the joints of the pump-rod-that is, none of the pump-rod sections CC3 will unscrew from the couplings CO2, nor can the screwthreads Aunscrew from the coupling C. In a like manner the nut or sleeve B cannotunscrew from the end D ofthe cage E as long as the pump-rod is turned inthe direction indicated, and hence an easy unscrewing of the threads A2from the threads B takes place.

In order to facilitate the easy unscrewing oi the threads A2 from thethreads B I preier to make the pitch of the threads A2 B somewhat lessthan that oi the screw-threads A and those of the pump-rod sections C C3and the couplings C C2. In some cases the plunger F and the firstplunger or section C becomes sanded up, and in order to withdraw thepump-rod minus the plunger F from the said first pump-rod section C itis desirable to connect the nut or sleeve B with the upper end of theiirst pump-rod section C', as illustrated in Fig. 2. In this case theiirst coupling C is screwed onto the top D of the cage E and is engagedby the first pumprod section C, the u per threaded end of which screwsinto t e screw-threads B3, formed in the nut or sleeve B between thethreads B B2. The coupling-rod A in this case engages with its threadsA2. The

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threads B and the threads A of the coupling-rod A screw into the secondcoupling C2, connected with the second section C3 of the pump-rod. Theoperation in this case is the same as above described in reference toFig. l, with the only dierence that when the pump-rod is turned in aleft-hand direction then the thread A2 unscrews from the thread B of thenut or sleeve B7 held stationary on the upper end of the rst pump-rodsection C.

The device is very simple and durable in construction and is composed ofbut few parts notliable to get easi y out of order.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. A pump-rod coupling comprising a vcoupling-nuthaving a right-hand thread and which screw-threads the right-handscrewthread is adapted to engage a coupling of a ump-rod, and acoupling-nut having a leftand screw-thread engaged by the correspondingleft-hand thread of the said coupling-rod, the said coupling-nut alsohaving two right-hand threads of different diameters adapted to engagethe threaded ends of a plunger or the first section of a plunger-rod. 3.A pump-rod coupling comprising a coupling-rod having a right-handscrewthread and a left-hand screw-thread of less pitch than theright-hand screw-thread, and of which screW-threadsthe right-handscrewthread isadapted to engage a coupling of a ump-rod, and acoupling-nut having a leftand screw-thread engaged by the correspondingleft-hand thread of the said coupling-rod, the said coupling-nut alsohaving two right-hand threads of different diameters adapted to engagethe threaded ends of a plunger or the irst -section of a plunger-rod. Intestimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

LE ROY PITCHER.

Witnesses A. WEABER, N. L. BAKER.

